Kevin Youkilis, who missed Sunday's game with a sore hip, is back in the lineup on Monday as the Red Sox prepare to face Angels starter Jered Weaver, who concluded a historic April with a 6-0 record. Jason Varitek will be behind the plate with Clay Buchholz on the mound.

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Red Sox leftfielder Carl Crawford had arguably the biggest hit of his short tenure in Boston Sunday when he punched a walk-off single up the middle off Seattle reliever Jamey Wright in the bottom of the ninth to lead the home team to a 3-2 win. The single scored Jed Lowrie, who had reached third base after Seattle rightfielder Ichiro Suzuki lost the ball in the afternoon Fenway sun. The walk-off was Crawford's seventh in his 10-year career but was his first for Boston since signing with the team last winter.

Red Sox pitching coach Curt Young said that starter Josh Beckett will throw a side session on Monday, at which point the team will determine when he will make his next start. Young said that there is now physical issue for the pitcher, who is 2-1 with a 2.65 ERA in five starts this year.

With Clay Buchholz's next start being pushed back to Monday and Tim Wakefield taking over on Sunday, the Red Sox rotation over the next few days became a bit of conundrum. The picture became a little clearer Sunday when Boston manager Terry Francona announced that team ace Jon Lester will start on Tuesday on regular four-days rest in the second game of the upcoming home series with the Angels.

With Kevin Youkilis sidelined by his sore hip, the Red Sox lineup will assume a different shape against Mariners ace Felix Hernandez. David Ortiz will bat cleanup, while Jed Lowrie (batting sixth) will play third base. Marco Scutaro gets the start at shortstop against the reigning American League Cy Young winner. Jarrod Saltalamacchia, meanwhile, will be behind the plate for Tim Wakefield's first start of the season.

A few members of the Red Sox talked about the frustration that is building in the team's clubhouse after ending April with an 11-15 mark thanks to the Sox' 2-0 loss to the Mariners Saturday night at Fenway Park.

"We just hope everybody stays patience with us," said Youkilis, who left Saturday night's game in the seventh inning for a pinch-runner due to stiffness in his hip.

The Red Sox fell deeper into last-place in the American League East Saturday with a 2-0 loss to the Mariners at Fenway Park. The Sox finish April with an 11-15 mark, having lost their second straight to Seattle.

The Red Sox couldn't solve Seattle pitching when it counted, stranding 11 runners while going 0-for-11 with runners in scoring position. The Sox managed five hits and five walks against Mariners starter Doug Fister, but couldn't scratch out any runs against in the righty's 5 2/3 innings.

Tim Wakefield will make his first start of the season Sunday afternoon, replacing scheduled starter Clay Buchholz, who was sent home on Friday with what Red Sox manager Terry Francona called "intestinal turmoil." Buchholz (1-3, 5.33 ERA) will be pushed back to Monday for the opener of a four-game series with the Angels.

In seven relief appearances this season, Wakefield has no record with a 5.56 ERA over 11 1/3 innings. Sunday's start will be his first since Oct. 2 against the Yankees in the 160th game of the 2010 season.